Fenri Lunaedge (フェンリー・ルナエッジ,Fenrī Runaejji?) is one of the bosses of Mega Man Zero 4. He is a Mutos Reploid based on the Fenrisulfr (also called Fenrir) wolf from Norse mythology. Fenri uses ice in battles and can attack at high speed. He occupies the Hibernation Chamber which houses old Cyber-elf experiments that have been asleep for some time. They begin to awaken, and Zero has to defeat them as well as Fenri.

He attacks by creating clones of himself made of ice, spin like a ball across the screen, dashing towards Zero using the blades in his arms, and by launching ice slashes in a pattern. If the weather is tipped in his favor, the floor is sheathed in ice, making it even more difficult for Zero to avoid the fast-paced attacks. His EX Skill, the White Fang, involves him creating two large slashes, one on the floor and one on the ceiling.

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Fenri went berserk due to a bug in the altered Cyber-elf he was trying out. To stop him from running wild, he was put to sleep in cryogenic stasis and the entire building was demolished. He was later revived by Weil for the purposes of Operation Ragnarok. As Popla Cocapetri and Noble Mandrago both have skills related to cryogenic stasis, Fenri has an inherent aversion to them.

Fenri has sharp claws on his hands and feet, and also has giant ice blades growing out of his arms. He could cause a lot of damage just by charging an opponent.